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Prior Experience Affects the Oviposition Behavior in Evania Appendigaster (L.) ( Hymenoptera: Evaniidae)

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Prior Experience Affects the Oviposition Behavior in Evania Appendigaster (L.) ( Hymenoptera: Evaniidae) 研究報告 中華昆蟲 20 : 13-21 ( 2000) Chinese J. Entomol. 20: 1 3 - 21 (2000) Prior Experience Affects the Oviposition Behavior in Evania appendigaster (L.) ( Hymenoptera: Evaniidae) Chin-Chang Yeh and Chi-Chang Huang Department of Entomology, National Chung- Hsing University Taichung, Taiwan 402, R.O.C. Cheng-Shing Lin* Department of Zoology, National Museum of Natural Science Taichung, Taiwan 404, R.O.C. ABSTRACT We evaluated the effect of prior ovipositional experience on the oviposition of Evania appendigaster (L.) (Hymenoptera: Evaniidae). Prior experience reduced the total time of the oviposition sequence; the preoviposition quiescent stage occupied most of the time for oviposition and was the most important plastic behavioral stage. If oviposition experience was withheld for more than three days, females seemed to forget what they had learned and acted as naive females. Booster experience did not decrease total time to finish the sequence of oviposition behavior. Key words: Evania appendigaster, Periplaneta americana, behavior, learning. Introduction the habitat alone (Wardle and Borden, 1985; 1991). In four species of aphidiid wasps, prior The ensign wasp Evania appendigaster oviposition experience was found to affect is a solitary parasitoid of cockroach. It can host selection (Chow and Mackauer, 1992). be found in temperate and subtropical Oviposition experience also reduced the areas (Townes, 1949). Its hosts include approach time of Ooencyrtus kuvanae; the Periplaneta americana, P. australasiae, P. more experience in oviposition the wasp brunea, Blatta orientalis, Cutilia soror, and had acquired the less oviposition time Neostylopyga rhombifolia (Lebeck, 1991). needed (Lee and Lee, 1989; Lee et al., 1989). Its developmental period lasts for about Females with oviposition experience on a 38-40 days, and the longevity of adults is host pupa are more likely than naive about 13 to 15 days in the laboratory (Yeh females to walk upwind in kairomone- and Mu, 1994a). E. appendigaster shows a laden air and to do so more rapidly ( Carde fixed action pattern of oviposition behavior and Lee, 1989). Females of the polyph- on the ootheca of P. americana. Its agous ichneumonid parasitoid Exeristes oviposition sequence can be divided into roborator demonstrate associative learning seven steps: (1) host contact (with antennal by responding with ovipositor probes into drumming), (2) ovipositor extension and *Correspondence address e-mail:[email protected] Prior Experience Affects Oviposition Behavior in E. appendigaster 13 tapping, (3) preoviposition quiescence, (4) three eggs, one each on the 1st, 2nd, and drilling, (5) ovipositing, (6) withdrawal, 5th days, respectively (1-2-5); (4) 4th and (7) departure. experiment: oviposition of three eggs, one Females are attracted to host ootheca. each on the 1st, 2nd, and 7th days, They contact the ootheca by antennal respectively (1-2-7); (5) 5th experiment: drumming, then either fly away or stay on oviposition of three eggs, one each on the it. The wasps extend the ovipositor and tap 1st, 2nd, and 9th days, respectively (1-2-9); the ootheca surface. It takes about 10 (6) 6th experiment: oviposition of 2 eggs, minutes for the wasps to locate the “right one each on the 1st, and 4th days, spot”, and complete the preoviposition respectively (1-4); (7) 7th experiment: ovi- quiescent stage. Females move their ab- position of three eggs, one on the 1st day domen up and down, drill the ovipositor and two consecutive ovipositions on the 5th into the ootheca, pull it out, and drill day (1-5-5); (8) 8th experiment: oviposition repeatedly, looking for a good position. of one egg on the 1st day and two They then just sit on ootheca and lay eggs consecutive ovipositions on the 6th day followed by withdrawal of the ovipositor (1-6-6); (9) 9th experiment: oviposition of and departure. The effects of prior ovi- one egg on the 1st day, and two consecutive position experience on the oviposition be- ovipositions on the 8th day (1-8-8). havior of the ensign wasp were tested in Wasps were exposed to consecutive the laboratory. In this paper, we define oviposition experiences to determine if oviposition as actual egg laying by females, prior experience reduces the time of ovi- oviposition behavior as all seven behav- position. Wasps with prior oviposition ex- ioral steps, and an oviposition event as a perience were held without additional single sequence of oviposition behavior. experience for one day (1-2-3), three days (1-2-5) (1-4), five days (1-2-7), or seven Materials and Methods days (1-2-9), or in other experiments, for four days (1-5-5), five days (1-6-6), or seven Rearing of P. americana and E. days (1-8-8) followed by consecutive ovi- appendigaster was performed using the positions, to determine how long experi- methods of Yeh and Mu (1994a, b). Ooth- ence could be withheld, and if booster ecae used in the experiments were depo- experience could increase the oviposition sited by American cockroaches within 24 h efficiency and shorten the time of the of the experiments. A single naive female oviposition sequence. Each experiment was (i.e., without previous oviposition experi- done with eight replications. All experi- ence) ensign wasp (three days old and ments were carried out in a walk-in gro- mated at the day after emergence) was wth chamber (180 X 180 X 180 cm) at released in a lid-covered plastic cup (9 cm 26-28℃, 70-90% RH, with a L:D = 12:12 dia. X 5 cm) containing one ootheca, and photoperiod. the wasp oviposition behavior was obser- For data analysis, we used the split- ved. Detailed oviposition behavior and plot design. In the main plot, ovipsoitional total oviposition times were recorded with event treated as the treatment of one a V8 video camera. factor and the female as a block, arranged The following experiments were con- in a randomized complete block design. ducted: (1) 1st experiment: consecutive The oviposional stages were treated as ovipositions of three eggs on three oothecae treatments of the second factor, and were on the 1st day (indicated as 1-1-1); (2) 2nd assigned to subplots within each main plot. experiment: oviposition of three eggs, one Significance between treatments was eva- each on 1st, 2nd, and 3rd days, respectively luated and followed by range test (SAS, (1-2-3); (3) 3rd experiment: oviposition of 1988). All values are presented as mean ± 14 中華昆蟲第二十卷第一期 SD. between experienced and naive wasps. The stage of quiescent was significantly longer Results than the other stage both in the experi- enced wasps and the naive wasps. The Wasps were exposed to consecutive stage of oviposition was the next longer oviposition experiences on the same day stage in both experienced and naive wasps. (1-1-1) to determine if prior experience If booster experiences took place reduced the time of oviposition (Table 1). within three days, the total time to finish The total time needed to finish the the sequence of oviposition behavior was sequence of behavior was significantly significantly shorter in experienced wasps shorter for experienced than for naive (OEII) (i.e., 1-1, 1-2, 1-4) (Tables 1, 2, 4, 5, wasps. Time spent in the preoviposition and 6) than in naive wasps. In addition, quiescent stage and the withdrawal stage the preoviposition quiescent stage was was significantly shorter in experienced significantly shorter in experienced than wasps than in naive wasps. The total time in naive wasps. But, when oviposition spent by experienced wasps to finish the experience was withheld for more than sequence of behavior was not significantly three days (i.e., 1-5, 1-6, 1-8) (Tables 7, 8, different between oviposition events II and and 9), the total time to finish the sequence III (OEII & OEIII). There were significant of oviposition behaviors were not signi- differences in oviposition behavioral stages ficantly different between experienced and Table 1. Mean ovipositional time (sec.) ± SD of 3 consecutive ovipositions within 1 day (1-1-1) in E. appendigaster Oviposition Mean ovipositional time (sec.) ± SD (n = 8) Behavior OE I 1) OE II OE III 1. Host contact 16.6 ± 5.6a 2) 19.4 ± 8.5a 6.3 ± 7.8a 2. Tapping 93.6 ± 66.7a 42.5 ± 13.5a 70.1 ± 35.1a 3. Quiescence 560.5 ± 188.6a 342.6 ± 166.7b 375.4 ± 156.6b 4. Drilling 95.9 ± 86.9a 39.1 ± 27.8a 101.3 ± 63.9a 5. Oviposition 173.3 ± 40.3a 172.9 ± 69.7a 142.0 ± 20.7a 6. Withdrawal 71.5 ± 12.4a 55.6 ± 8.3a 46.6 ± 10.4a Total 1011.4 ± 299.2a 672.1 ± 168.3b 751.7 ± 169.3b 1.) OE = ovipositional event (I, II, III). 2.) Means in the same row followed by the same letter are not significantly different by Fisher ’s LSD test (p < 0.05 ) . Table 2. Mean ovipositional time (sec.) ± SD of 3 ovipositions with 1-day intervals (1-2-3) in E. appendigaster Oviposition Mean ovipositional time (sec.) ± SD (n = 8) behavior OE I (1st d) 1) OE II (2nd d) OE III (3rd d) 1. Host contact 28.5 ± 8.8a 2) 16.0 ± 7.9b 19.0 ± 10.6b 2. Tapping 141.8 ± 92.1a 76.3 ± 59.6b 57.3 ± 29.2b 3. Quiescence 618.1 ± 258.8a 411.9 ± 190.1b 359.8 ± 162.1b 4. Drilling 68.8 ± 49.2a 25.0 ± 8.0a 36.9 ± 27.5a 5. Oviposition 193.8 ± 106.1a 157.0 ± 42.5a 144.0 ± 44.2a 6. Withdrawal 63.2 ± 19.8a 49.1 ± 14.9a 52.8 ± 12.5a Total 1114.2 ± 290.8a 735.3 ± 175.6b 669.8 ± 202.6b 1.) OE = ovipositional event (I, II, III).
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